CVE-2022-32030 in AX1806
Summary
by MITRE • 07/01/2022
Tenda AX1806 v1.0.0.1 was discovered to contain a stack overflow via the list parameter in the function formSetQosBand.
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Analysis
by VulDB Data Team • 07/18/2022
The vulnerability identified as CVE-2022-32030 affects the Tenda AX1806 router firmware version 1.0.0.1 and represents a critical stack overflow condition that arises from improper input validation within the formSetQosBand function. This issue stems from the device's handling of the list parameter, which allows attackers to manipulate memory allocation and potentially execute arbitrary code on the affected device. The stack overflow occurs when the router processes user-supplied data without adequate bounds checking, creating a pathway for malicious actors to overwrite critical memory segments including return addresses and function pointers. This vulnerability resides within the router's Quality of Service configuration handling mechanism, specifically targeting the bandwidth allocation functionality that manages network traffic prioritization.
The technical exploitation of this vulnerability follows a well-established pattern that aligns with CWE-121 Stack-based Buffer Overflow, where insufficient input validation permits buffer overflows in stack memory regions. Attackers can craft malicious requests containing oversized list parameters that exceed the allocated buffer space within the formSetQosBand function, leading to memory corruption that may result in denial of service conditions or complete system compromise. The nature of this flaw places it within the ATT&CK framework under T1203 Exploitation for Client Execution and T1068 Exploitation for Privilege Escalation, as successful exploitation could enable attackers to gain unauthorized access to the device's administrative interface and potentially escalate privileges to execute commands with elevated permissions.
The operational impact of CVE-2022-32030 extends beyond simple denial of service scenarios, as the vulnerability creates opportunities for persistent network compromise and lateral movement within affected networks. When exploited, the stack overflow could allow remote attackers to inject malicious code that persists across reboots, potentially establishing backdoors or command and control channels that remain undetected by standard network monitoring tools. The affected Tenda AX1806 devices represent a significant risk to enterprise and residential networks since they often serve as primary gateway devices, making them attractive targets for attackers seeking to establish persistent access points within larger network infrastructures. Network administrators should consider this vulnerability as part of a broader attack surface that includes other unpatched network devices and IoT endpoints that may be equally susceptible to similar exploitation techniques.
Mitigation strategies for CVE-2022-32030 should prioritize immediate firmware updates from Tenda to address the stack overflow vulnerability in the formSetQosBand function. Organizations should implement network segmentation to isolate affected devices from critical systems and establish monitoring procedures to detect unusual network traffic patterns that may indicate exploitation attempts. The implementation of web application firewalls and intrusion detection systems can help identify and block malicious requests targeting the vulnerable parameter handling mechanism. Additionally, network administrators should disable unnecessary services and ensure that only authorized personnel have access to the router's administrative interfaces, reducing the attack surface and limiting potential exploitation opportunities. Regular vulnerability assessments and network scanning should be conducted to identify other devices that may be running vulnerable firmware versions or implementing similar flawed parameter handling mechanisms.